Dmitri Mendeleev and Lothar Meyer in 1869
Dmitri Mendeleev and Lothar Meyer
Dmitri Mendeleev and Julius Lothar Meyer independently published there versions of the Periodic Table between 1869 and 1870. Mendeleev's version would become the foundation of the table used today.
The periodic tables.
Hydrogen.
Go to this website
hassium
The columns are known as groups.
no, they depend on what country your in
he made up the periodic tables
Dmitri Mendeleev.
Their atomic mass
Periodic tables are important in most scientific classes because they help understand similarity of properties and reactions of elements.